Light projector



Dec. 27, 1927.

H. ECKSCHLAGER LIGHT PROJECTOR Filed July 7, 1924 Patented Dec. 27, 1927.

UNITED STATES PATENT OFFICE.

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Application filed m 7, 1924, Serial No.

My invention relates to light projectors, search lights and the like and more particularly to the reflectors for use with such apparatus.

llt is an object of my invention to provide a reflector which projects to either side and partly to the rear the light raysemitted from the source of light cooperating with it. If a reflector of this ty e is combined with a normal dishor cup-s aped reflector reflecting a cone of light, the normal reflector being arranged within and surrounded by the new reflector, there results a combination which-allows obtaining a lighted area which exceeds a hemisphere and is projected to the sides and to the rear.

in Fig. l.

about equal to three quarters of a sphere, the novel reflector emitting a beam of light of annular section which merges in the cone of light formed by the normal reflector and is reflector according to this invention referably comprises an annular convex re ecting surface which is so arranged in relation to an annular concave reflecting surface that the light rays projected onto said concave surface by said convex surface are partly reflected to the rear.

In the drawings aflixed to this specification and forming part thereof a device embodying m invention and comprising an annular re ector of channel like cross section is illustrated diagrammatically by way of example.

In the drawings Fig. 1 is a front elevation, and

Fig. 2 a cross section on the line III-11 The drawings show an annular reflector .surrounding' a cuphaped reflector of the normal type, but it is tobe understood that the former may also be used by itself or in combination with any other type of reflector.

The cup-shaped reflector a has four lamps I; mounted therein in the usual manner. It is surrounded by the annular reflector 0 of channel like cross section, the adjoining edges of the reflectors being connected by soldering or by other suitable means. The annular reflector c is substantially concave but provided with a convex reflecting surface (i at the rear. Four lamps e are arranged in this reflector. The two combined reflectors are mounted on a base plate f.

The current conducting wires are not shown 724,603, and in Germany August 11, 1928.

for thesake of simplicit and may be ar ranged as desired. The base plate is secured on a shaft 9 which maybe driven b an 'electromotor, not shown. On the sha t 9 two sl p rings h, c are provided to which current 1s supplied by brushes lo, 1..

The reflector a reflects the normal cone of light to the front. In the annular reflector c the light rays emitted by the lamps'e are partly pro ected to the front and partly onto the surfaces 0 and d of the reflector. The rays which strike the concave surface 0 of the reflector are partly projected onto the convex surface at which projects part of them back onto the concave surface a which thus pro ects to the sides and partly to the rear a beam of light of annular section as mdicated by the dotted lines 0 in Fig Q. The annular beam combines with the cone of light emitted by the normal reflector a so that an area of ight radiation is formed as lndicated by the lines m and o in Fig. 2.

- As clearly shown in Fig. 2 this area ea The intensity of radiation can "be irrcreased by causing rotation of the 'shafty which carries the device.

The new reflector is also an important improvement if used in connection with motor cars, a single reflector suflicin tc light not onl that part of the road Which is in front 0 the driver, but also the sides.

I wish it to be understood that I do not desire to be limited to the exact details cf construction shown and described, for obviskilled in the art. a

I claim .1. A reflector comprising an annular one modifications will occur to a person concave reflecting surface and an annular convex reflecting surface said concave surface being adapted to reflect to the rear of said reflector light rays projected onto it by said convex surface and a cup-shaped reflector surrounded by and arranged for reflection substantially in the same direction as said channel-shaped reflector.

2. Reflector comprising an annular concave reflecting surface in front of and an annular convex. reflecting surface at the rear of the source of light, said concave surface being adapted to reflect to the rear of said reflector light rays projected onto it by said convex surface and a cup-shaped reflector surrounded by and arranged for reflection substantially in .the same direction as said channel-shaped reflector.

3. Reflector comprising an annular concave reflecting surface in front of and an annular convex reflecting surface at the rear of the source of light, said convex surface extending beyond said concave surface,

said concave surface being adapted to reflect to the rear of said reflector light rays projected onto it by said convex surface and a cup-shaped reflector surrounded by and arranged for reflection substantially in 

